Watchguard Firebox SOHO 6 User Manual page 66

Chapter 4: Configure the Network Interfaces
The SOHO 6 uses two methods to determine if the external
interface connection is down:
• The status of the link to the nearest router
• A ping to a specified location
The SOHO 6 pings the default gateway or the location selected by
the administrator. If there is no response, the SOHO 6 switches to
the secondary external network connection.
When this upgrade option is activated, these actions automatically
occur:
• If the external connection fails, the optional port (OPT)
connection is opened and used.
• If the optional port (OPT) connection fails, the external port
(EXT) connection is opened and used.
• If the external port (EXT) and optional port (OPT) connections
fail, the SOHO 6 tries both ports until a connection is made.
When the optional port (OPT) is in use, the SOHO 6 does not
switch back to the external port (EXT) unless PPPoE is used to
assign IP addresses. After the SOHO 6 switches to the optional
port (OPT), the administrator must change the configuration back
to the external port (EXT) when the connection is restored.
If you use PPPoE, you can set an inactivity timeout that disables
inactive TCP connections during periods of inactivity. See
"Configuring the SOHO 6 external network for PPPoE" on page 34
for PPPoE configuration information. If your external connection
fails, the optional port connection is started and used. The optional
port (OPT) is used until the TCP connection becomes inactive
(timeout). When the traffic continues, the SOHO 6 connects
through the external port (EXT) first. If a connection is made, the
external port (EXT) is used. If the external port (EXT) is not
available, the SOHO 6 connects through the optional port (OPT).
44 WatchGuard Firebox SOHO 6